As of March 23, 2026, the three largest insider holders of OSUR are Manner Carrie Eglinton (President Ceo, 2.14Mn shares), Kenneth J Mcgrath (Chief Financial Officer, 535.24K shares), Kathleen Gallagher Weber (Chief Product Officer, 391.21K shares).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| Manner Carrie Eglinton | President Ceo | 2,190,874 | 0 | 23 Mar, 2026 |
| Manner Carrie Eglinton | President Ceo | 2,136,552 | 0 | 03 Mar, 2026 |
| Kenneth J Mcgrath | Chief Financial Officer | 589,562 | 0 | 23 Mar, 2026 |
| Kenneth J Mcgrath | Chief Financial Officer | 535,241 | 0 | 03 Mar, 2026 |
| Kathleen Gallagher Weber | Chief Product Officer | 391,206 | 0 | 04 Mar, 2025 |
| Stephen S Phd Tang | President And Ceo | 349,793 | 0 | 03 Feb, 2022 |
| Michele Marie Anthony | Svp Finance Cao | 185,788 | 0 | 19 Mar, 2026 |
| Mara G. Aspinall | 178,758 | 0 | 15 May, 2025 | |
| John P. Kenny | 163,608 | 0 | 19 Dec, 2025 | |
| Nancy J Gagliano | 160,254 | 0 | 02 Dec, 2025 | |
| Michele Marie Anthony | Svp Finance Cao | 143,502 | 0 | 04 Mar, 2025 |
| Lelio Marmora | 130,760 | 0 | 15 May, 2025 | |
| David Shulkin | 126,335 | 0 | 15 May, 2025 | |
| Jack E Jerrett | Svp General Counsel Amp; Cco | 124,555 | 0 | 03 Jan, 2022 |
| Lisa Nibauer | President Of Diagnostics | 123,479 | 0 | 12 May, 2022 |
| Roberto Cuca | Cfo | 114,815 | 0 | 10 May, 2021 |
| Michael Celano | 111,823 | 0 | 16 Aug, 2022 | |
| Ronny B Lancaster | 104,782 | 0 | 29 Aug, 2022 | |
| Robert W. Mcmahon | 99,919 | 0 | 04 Aug, 2025 | |
| Scott Gleason | Interim Cfo/Svp Ir | 96,509 | 0 | 24 May, 2022 |
| Agnieszka Gallagher | General Counsel Amp; Cco | 90,584 | 0 | 03 Feb, 2022 |
| James A Datin | 82,146 | 0 | 16 May, 2024 | |
| Eamonn P Hobbs | 61,452 | 0 | 18 May, 2022 | |
| Steven Kyle Boyd | 34,632 | 0 | 02 Dec, 2025 | |
| Anne Clem Whitaker | 23,840 | 0 | 17 May, 2023 |
* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.
| Transaction Date | Insider Name | Security Class | Transaction Type | Shares Traded | Price | Shares Remaining | Ownership | Code |
|---|---|---|---|---|---|---|---|---|
| 20 Mar, 2026 | Manner Carrie Eglinton | Common Stock | A | 32,300 | $2.93 | 2,190,874 | D | P |
| 20 Mar, 2026 | Kenneth J Mcgrath | Common Stock | A | 32,300 | $2.93 | 589,562 | D | P |
| 01 Mar, 2026 | Michele Marie Anthony | Common Stock | A | 14,183 | $0.00 | 157,685 | D | A |
| 01 Mar, 2026 | Michele Marie Anthony | Common Stock | D | 4,062 | $3.04 | 153,623 | D | F |
| 01 Mar, 2026 | Michele Marie Anthony | Common Stock | D | 10,817 | $3.04 | 142,806 | D | F |
| 02 Mar, 2026 | Michele Marie Anthony | Common Stock | A | 42,982 | $0.00 | 185,788 | D | A |
| 13 Mar, 2026 | Manner Carrie Eglinton | Common Stock | A | 22,022 | $3.00 | 2,158,574 | D | P |
| 13 Mar, 2026 | Kenneth J Mcgrath | Common Stock | A | 22,021 | $3.00 | 557,262 | D | P |
| 01 Mar, 2026 | Manner Carrie Eglinton | Common Stock | A | 129,032 | $0.00 | 1,959,859 | D | A |
| 01 Mar, 2026 | Kenneth J Mcgrath | Common Stock | A | 26,814 | $0.00 | 475,277 | D | A |
| 01 Mar, 2026 | Kenneth J Mcgrath | Common Stock | A | 26,814 | $0.00 | 475,277 | D | A |
| 01 Mar, 2026 | Manner Carrie Eglinton | Common Stock | A | 129,032 | $0.00 | 1,959,859 | D | A |
| 01 Mar, 2026 | Kenneth J Mcgrath | Common Stock | D | 7,639 | $3.04 | 467,638 | D | F |
| 01 Mar, 2026 | Manner Carrie Eglinton | Common Stock | D | 56,116 | $3.04 | 1,903,743 | D | F |
| 01 Mar, 2026 | Kenneth J Mcgrath | Common Stock | D | 7,639 | $3.04 | 467,638 | D | F |
| 01 Mar, 2026 | Manner Carrie Eglinton | Common Stock | D | 56,116 | $3.04 | 1,903,743 | D | F |
| 01 Mar, 2026 | Manner Carrie Eglinton | Common Stock | D | 122,655 | $3.04 | 1,781,088 | D | F |
| 01 Mar, 2026 | Kenneth J Mcgrath | Common Stock | D | 20,745 | $3.04 | 446,893 | D | F |
| 01 Mar, 2026 | Manner Carrie Eglinton | Common Stock | D | 122,655 | $3.04 | 1,781,088 | D | F |
| 01 Mar, 2026 | Kenneth J Mcgrath | Common Stock | D | 20,745 | $3.04 | 446,893 | D | F |